Rollover and out "hit area"

I have a mc that im using as a button with rollover and out animations.

On mouse rollover content appears that is apart of movie but not apart of the actual praphical button.

eg:when you roll over a small red square the “word square” fades in below the it(the small red square)

the problem is that when I roll over the “word square” although not visible at the time it triggers the animation

How can I make it so that the roll over animation only occurs when the small red square is rolledover and not the “word Square”?

Get it?

Can I make a “hit” area on my rollover and out mc symbol like a button symbol?